In graphite,the $C$-atom is in which state of hybridisation?

Give examples of hybridization involving $s$,$p$,and $d$ orbitals.

The hybridisations of $N$-orbitals in $NO_3^{-}$,$NO_2^{-}$ and $NH_4^{+}$ respectively are

How many $sp^2$ and $sp$ hybridized carbon atoms are present respectively in the following compound? (The structure is $1,2-didehydrobenzene$ or $benzyne$ derivative,specifically $1,2-didehydrocyclohexadiene$ structure shown in the image).

Explain $sp^{3}d$ hybridization by a suitable example.

Determine the hybridization of the sulfur atom in $SO_2$.